321320402532 has 36 divisors (see below), whose sum is σ = 847540774080. Its totient is φ = 102449983152.

The previous prime is 321320402531. The next prime is 321320402539. The reversal of 321320402532 is 235204023123.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×321320402532² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321320402496 and 321320402505.

It is not an unprimeable number, because it can be changed into a prime (321320402531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194033232 + ... + 194034887.

It is an arithmetic number, because the mean of its divisors is an integer number (23542799280).

Almost surely, 2^321320402532 is an apocalyptic number.

It is an amenable number.

321320402532 is an abundant number, since it is smaller than the sum of its proper divisors (526220371548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321320402532 is a wasteful number, since it uses less digits than its factorization.

321320402532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388068152 (or 388068147 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 321320402532 its reverse (235204023123), we get a palindrome (556524425655).

The spelling of 321320402532 in words is "three hundred twenty-one billion, three hundred twenty million, four hundred two thousand, five hundred thirty-two".